F-Secure identifies the worm as Bropia.A, other antivirus software (like including Kaspersky) labels it IM-Worm.Win32.VB.a.
When received and executed by the victim, the worm places itself in the C directory with a random filename like:
sexy_bedroom.pif
drunk_lol.pif
naked_party.pif
webcam_(random number).pif
love_me.pif and similar looking names.
It then automatically sends itself to active MSN Messenger contacts. It also drops and executes oms.exe, a variant of Rbot, which copies itself as lexplore.exe and adds two registry keys so it will be executed at next system startup. The bot can be used as a backdoor, logging keystrokes, relaying spam and for various other purposes and is therefor a huge security threat to your system. Brobia.A can also disable mouse right button and manipulate Windows mixer volume settings.

If you receive a file transfer request for such a file, press ALT-D or click Decline. Don't ever execute the file. If you did, delete the file immediately and permanently from your system (My Received Files and C drive) and take necessary security measures. For more information, visit F-Secure.
Source: Mess with MSN Messenger



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